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High-frequency dynamics of spin-polarized carriers and photons in a laser

DSpace at IIT Bombay

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Title High-frequency dynamics of spin-polarized carriers and photons in a laser
 
Creator SAHA, D
BASU, D
BHATTACHARYA, P
 
Subject quantum dots
injection
gaas
semiconductor
 
Description The high-frequency dynamics of spin-polarized carriers and photons in a spin laser have been studied. The transient response of the device obtained from the rate equations is characterized by two sets of relaxation oscillations in the carrier and photon distributions corresponding to the two polarization modes. Consequently two distinct resonant peaks are observed in the small-signal modulation response. The calculated transient characteristics indicate that the best results are obtained from a spin laser when only the favored polarization mode, with lower threshold, is operational. Under this condition the small-signal modulation bandwidth is higher than that in a conventional laser, the threshold current is lower and the output polarization can be 100% with appropriate bias conditions, independent of the spin polarization of carriers in the active region. Measurements were made at 230 K on a InAs/GaAs quantum dot spin vertical cavity surface emitting laser. A time-averaged output polarization of 55% is measured with an active region spin polarization of 5-6 %. The experimental results are in good agreement with calculated data.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-16T21:10:59Z
2011-12-26T12:49:57Z
2011-12-27T05:35:49Z
2011-07-16T21:10:59Z
2011-12-26T12:49:57Z
2011-12-27T05:35:49Z
2010
 
Type Article
 
Identifier PHYSICAL REVIEW B, 82(20), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.82.205309
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4532
http://hdl.handle.net/10054/4532
 
Language en